If I want to insert a sample text, the keyboard takes NOT the letters 'a', 'g' or 'h', except in capital letters. If I paste a text, 'a', 'g' and 'h' are accepted. A mystery .... If i press these special letters there is no keyboard action - only in fontexpert, and the keyboard works well in any other programm.

I really cannot reproduce this issue in the latest at this moment release FontExpert 2014 version 12 Release 2. (Tested it also with German language interface.) Can you please give some more details in which version of Windows you used FontExpert - Windows 7, 8, 8.1 - x64 or x32?

It's solved. But I don't know the reason why. BUT after upgrading to Windows 10 every letter is shown and the problem is gone. A mystery - but a mystery with my machine working with your software i think.